Portable Network Graphics (PNG), a raster graphics format
that employs lossless data compression which is more suitable
for line art than the lossy jpg format. Unlike the gif format,
png is not encumbered by requirements for a patent license.

PS

Postscript (PS) is a
vector graphics ASCII text language widely used in printers and
publishing. Postscript was developed by adobe systems and is
starting to show its age: for example is does not have an alpha
channel. PDF was designed in part as a next-generation document
format to replace postscript

pygtk

pygtk provides python wrappers for
the GTK widgets library for use with the GTK or GTKAgg
backend. Widely used on linux, and is often packages as
‘python-gtk2’

pyqt

pyqt provides python
wrappers for the Qt widgets library and is required by
the matplotlib Qt5Agg and Qt4Agg backends. Widely used on linux
and windows; many linux distributions package this as
‘python-qt5’ or ‘python-qt4’.

pytz provides the Olson tz
database in Python. it allows accurate and cross platform
timezone calculations and solves the issue of ambiguous times at
the end of daylight savings

Qt

Qt is a cross-platform
application framework for desktop and embedded development.

Qt4

Qt4 is the previous,
but most widely used, version of Qt cross-platform application
framework for desktop and embedded development.

Qt5

Qt5 is the current
version of Qt cross-platform application
framework for desktop and embedded development.

raster graphics

Raster graphics, or bitmaps,
represent an image as an array of pixels which is resolution
dependent. Raster graphics are generally most practical for
photo-realistic images, but do not scale easily without loss of
quality.

Tagged Image File Format (TIFF) is a
file format for storing images, including photographs and line
art.

Tk

Tk is a graphical user interface for Tcl
and many other dynamic languages. It can produce rich, native
applications that run unchanged across Windows, Mac OS X, Linux
and more.

vector graphics

vector graphics use geometrical
primitives based upon mathematical equations to represent images
in computer graphics. Primitives can include points, lines,
curves, and shapes or polygons. Vector graphics are scalable,
which means that they can be resized without suffering from
issues related to inherent resolution like are seen in raster
graphics. Vector graphics are generally most practical for
typesetting and graphic design applications.

wxpython

wxpython provides python wrappers
for the wxWidgets library for use with the WX and WXAgg
backends. Widely used on linux, OS-X and windows, it is often
packaged by linux distributions as ‘python-wxgtk’

wxWidgets

WX is cross-platform GUI and
tools library for GTK, MS Windows, and MacOS. It uses native
widgets for each operating system, so applications will have the
look-and-feel that users on that operating system expect.